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2003 GMC Sierra 3500
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Exhaust Manifolds, Pipes & Mufflers
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OEM (Genuine) 2003 GMC Sierra 3500 Muffler & Pipe
PartNumber: 15262865
Product Specifications- Notes: Silverado, Sierra; 6.6L; 8 Box; Extended Cab; 6.6 Liter Turbo Diesel, 1St Design, Extended Cab, 6 1/2 Foot Bed;6.6 Liter Turbo Diesel, 1St Design, Extended Cab, 8 Foot Bed
- Other Names: Muffler, Muffler & Pipe
- Item Dimensions: 137.3 x 26.5 x 16.2 inches
- Item Weight: 288.50 Pounds
- Fitment Type: Direct Replacement
- Part Description: 2003 GMC Sierra 3500 Muffler & Pipe
Vehicle Fitment- 2003 GMC Sierra 3500 | Base, SL, SLE, SLT, WT | 8 Cyl 6.6 L DIESEL
$742.80 MSRP:$1120.61You Save: $377.81 (34%)
Walker® Quiet Flow Steel Oval Aluminized Exhaust Muffler for 2003 GMC Sierra 3500
PartNumber: 21522Product Specifications- Notes: Premium - Limited Lifetime Warranty; If welded Assy, replace all Reqd parts.
- Body Height: 5.500
- Body Length: 20.000
- Body Material: Stainless Steel
- Body Width: 11.000
- Exhaust Component Mount Type: No Mounts
- Finish: Aluminized
- Grade Type: Regular
- Inlet 1 Inside Diameter: 3.000
- Inlet 1 Type: Pipe Connection
- Inlet Configuration: Offset
- Inlet Offset: 3.5
- Internet Product Code (IPC): 6E97125578E
- Item has MSDS (SDS): N
- Max Year Covered: 2007
- MFG Brand Name: Walker Exhaust
- MFG Model # (Series): 21522
- MFG Name: Tenneco, Inc
- Min Year Covered: 2001
- Most Popular Make / Model: Chevrolet Silverado 2500 HD
- Most Popular Year: 2005
- Muffler Body Height: 5.5
- Muffler Body Length: 20.0
- Muffler Body Material: Steel
- Muffler Body Width: 11.0
- Muffler Color / Finish: Aluminized
- Muffler Inlet: Offset
- Muffler Inlet Connection Type: Pipe Connection
- Muffler Inlet Count: 1
- Muffler Inlet Diameter (in): 3.0
- Muffler Inlet Diameter 2 (in): 0.0
- Muffler Inlet Diameter Designation: Inside Diameter
- Muffler Outlet: Offset
- Muffler Outlet Connection Type: Pipe Connection
- Muffler Outlet Count: 1
- Muffler Outlet Diameter (in): 3.0
- Muffler Outlet Diameter Designation: Inside Diameter
- Muffler Overall Length: 27.0
- Muffler Reversible: No
- Muffler Shape: Oval
- Outlet 1 Inside Diameter: 3.000
- Outlet Configuration: Offset
- Overall Length: 27.000
- Product Grade: Economy
- Reversible: No
- Shape: Oval
- Supplier Company Name: Tenneco, Inc
- Total Part VIO: 702129
- Universal Or Specific Fit: Specific
- UPC: 086387215220
- Part Description: 2003 GMC Sierra 3500 Quiet Flow Steel Oval Aluminized Exhaust Muffler
Vehicle Fitment- 2003 GMC Sierra 3500 | All Trims | 8 Cyl 6.6L
OEM (Genuine) 2003 GMC Sierra 3500 Exhaust Muffler Assembly (W/ Exhaust & T/Pipe & 3W
PartNumber: 15798962
Product Specifications- Notes: Silverado, Sierra; 6.0L; 6 1/2 Box; Federal; Extended Cab; W/O Heavy Duty
- Other Names: Muffler
- Item Dimensions: 122.9 x 24.4 x 15.6 inches
- Item Weight: 68.80 Pounds
- Fitment Type: Direct Replacement
- Replaces: 15094497, 15147361, 15070023, 15113072, 15103198
- Part Description: 2003 GMC Sierra 3500 Exhaust Muffler Assembly (W/ Exhaust & T/Pipe & 3W
Vehicle Fitment- 2003 GMC Sierra 3500 | Base, SL, SLE, SLT, WT | 8 Cyl 6.0 L CNG, 8 Cyl 6.0 L GAS
OEM (Genuine) 2003 GMC Sierra 3500 Muffler Asm-Exhaust (W/ Exhaust & T/Pipe & 3W
PartNumber: 15798954Product Specifications- Notes: Silverado, Sierra; 6.0L; 6 1/2 Box; Federal; Extended Cab; W/Heavy Duty
- Other Names: Muffler
- Item Dimensions: 127.3 x 26.6 x 17.1 inches
- Item Weight: 68.10 Pounds
- Fitment Type: Direct Replacement
- Replaces: 15147362, 15113073
- Part Description: 2003 GMC Sierra 3500 Muffler Asm-Exhaust (W/ Exhaust & T/Pipe & 3W
Vehicle Fitment- 2003 GMC Sierra 3500 | Base, SL, SLE, SLT, WT | 8 Cyl 6.0 L CNG, 8 Cyl 6.0 L GAS, 8 Cyl 8.1 L GAS
OEM (Genuine) 2003 GMC Sierra 3500 Exhaust Muffler Assembly (W/ Exhaust & T/Pipe & 3W
PartNumber: 15798947
Product Specifications- Notes: Silverado, Sierra; 8.1L; 6 1/2 Box; California; Extended Cab
- Other Names: Muffler, Muffler & Pipe
- Item Dimensions: 124.6 x 31.0 x 17.0 inches
- Item Weight: 68.10 Pounds
- Fitment Type: Direct Replacement
- Replaces: 15147352
- Part Description: 2003 GMC Sierra 3500 Exhaust Muffler Assembly (W/ Exhaust & T/Pipe & 3W
Vehicle Fitment- 2003 GMC Sierra 3500 | Base, SL, SLE, SLT, WT | 8 Cyl 6.0 L CNG, 8 Cyl 6.0 L GAS, 8 Cyl 8.1 L GAS
OEM (Genuine) 2003 GMC Sierra 3500 Muffler
PartNumber: 15798948Product Specifications- Notes: Silverado, Sierra; 6.0L; 6 1/2 Box; California; Crew Cab;Silverado, Sierra; 6.0L; 6 1/2 Box; Federal; Crew Cab;Silverado, Sierra; 8.1L; 6 1/2 Box; California; Crew Cab;Silverado, Sierra; 8.1L; 6 1/2 Box; Federal; Crew Cab
- Other Names: Muffler
- Item Dimensions: 152.7 x 26.3 x 15.5 inches
- Item Weight: 75.60 Pounds
- Fitment Type: Direct Replacement
- Replaces: 15113063, 15103189, 15147353, 15077779, 15077763
- Part Description: 2003 GMC Sierra 3500 Muffler
Vehicle Fitment- 2003 GMC Sierra 3500 | Base, SL, SLE, SLT, WT | 8 Cyl 6.0 L CNG, 8 Cyl 6.0 L GAS, 8 Cyl 8.1 L GAS
OEM (Genuine) 2003 GMC Sierra 3500 Exhaust Muffler Assembly (W/ Exhaust & T/Pipe & 3W
PartNumber: 15798946Product Specifications- Notes: Silverado, Sierra; 6.0L; 6 1/2 Box; California; Extended Cab; All;Silverado, Sierra; 8.1L; 6 1/2 Box; Federal; Extended Cab
- Other Names: Muffler
- Item Dimensions: 131.9 x 31.3 x 17.3 inches
- Item Weight: 76.20 Pounds
- Fitment Type: Direct Replacement
- Part Description: 2003 GMC Sierra 3500 Exhaust Muffler Assembly (W/ Exhaust & T/Pipe & 3W
Vehicle Fitment- 2003 GMC Sierra 3500 | Base, SL, SLE, SLT, WT | 8 Cyl 6.0 L CNG, 8 Cyl 6.0 L GAS, 8 Cyl 8.1 L GAS
OEM (Genuine) 2003 GMC Sierra 3500 Exhaust Muffler Assembly (W/ Exhaust & T/Pipe & 3W
PartNumber: 15798950
Product Specifications- Notes: Silverado, Sierra; 6.0L; 8 Box; W/O Extended Cab; W/O Rear Exit Exhaust; California; W/Heavy Duty;Silverado, Sierra; 6.0L; 8 Box; W/O Extended Cab; W/O Rear Exit Exhaust; Federal; W/Heavy Duty;Silverado, Sierra; 8.1L; 8 Box; W/O Extended Cab; All;Silverado, Sierra; 8.1L; 8 Box; W/O Extended Cab; Federal
- Other Names: Muffler
- Item Dimensions: 110.4 x 30.9 x 17.1 inches
- Item Weight: 57.70 Pounds
- Fitment Type: Direct Replacement
- Part Description: 2003 GMC Sierra 3500 Exhaust Muffler Assembly (W/ Exhaust & T/Pipe & 3W
Vehicle Fitment- 2003 GMC Sierra 3500 | Base, SL, SLE, SLT, WT | 8 Cyl 6.0 L CNG, 8 Cyl 6.0 L GAS, 8 Cyl 8.1 L GAS
OEM (Genuine) 2003 GMC Sierra 3500 Exhaust Muffler Assembly (W/ Exhaust Pipe & Tail Pipe)
PartNumber: 15262867Product Specifications- Notes: Silverado, Sierra; 6.6L; 8 Box; Crew Cab; 6.6 Liter Turbo Diesel, 1St Design, Crew Cab, 8 Foot Bed
- Other Names: Muffler, Muffler & Pipe
- Item Dimensions: 151.6 x 35.2 x 20.1 inches
- Item Weight: 472.90 Pounds
- Fitment Type: Direct Replacement
- Replaces: 15131902
- Part Description: 2003 GMC Sierra 3500 Exhaust Muffler Assembly (W/ Exhaust Pipe & Tail Pipe)
Vehicle Fitment- 2003 GMC Sierra 3500 | Base, SL, SLE, SLT, WT | 8 Cyl 6.6 L DIESEL
OEM (Genuine) 2003 GMC Sierra 3500 Muffler & Pipe
PartNumber: 15262864Product Specifications- Notes: Silverado, Sierra; 6.6L; 6 1/2 Box; Extended Cab; All
- Other Names: Muffler, Muffler & Pipe
- Fitment Type: Direct Replacement
- Part Description: 2003 GMC Sierra 3500 Muffler & Pipe
Vehicle Fitment- 2003 GMC Sierra 3500 | Base, SL, SLE, SLT, WT | 8 Cyl 6.6 L DIESEL
OEM (Genuine) 2003 GMC Sierra 3500 Muffler Asm-Exhaust (W/ Exhaust & T/Pipe & 3W
PartNumber: 15798949
Product Specifications- Notes: Silverado, Sierra; 6.0L; 8 Box; W/Extended Cab; W/O Rear Exit Exhaust; All;Silverado, Sierra; 8.1L; 8 Box; W/Extended Cab; All
- Other Names: Muffler, Muffler & Pipe
- Item Dimensions: 137.7 x 30.6 x 17.3 inches
- Item Weight: 76.70 Pounds
- Fitment Type: Direct Replacement
- Part Description: 2003 GMC Sierra 3500 Muffler Asm-Exhaust (W/ Exhaust & T/Pipe & 3W
Vehicle Fitment- 2003 GMC Sierra 3500 | Base, SL, SLE, SLT, WT | 8 Cyl 6.0 L CNG, 8 Cyl 6.0 L GAS, 8 Cyl 8.1 L GAS
OEM (Genuine) 2003 GMC Sierra 3500 Muffler Asm-Exhaust (W/ Exhaust & T/Pipe & 3W
PartNumber: 15147356Product Specifications- Notes: Silverado, Sierra; 6.0L; 8 Box; W/O Extended Cab; W/O Rear Exit Exhaust; California; W/O Heavy Duty;Silverado, Sierra; 6.0L; 8 Box; W/O Extended Cab; W/O Rear Exit Exhaust; Federal; W/O Heavy Duty
- Other Names: Muffler
- Item Dimensions: 97.7 x 32.2 x 15.5 inches
- Item Weight: 66.20 Pounds
- Fitment Type: Direct Replacement
- Replaces: 88983230, 15070019
- Part Description: 2003 GMC Sierra 3500 Muffler Asm-Exhaust (W/ Exhaust & T/Pipe & 3W
Vehicle Fitment- 2003 GMC Sierra 3500 | Base, SL, SLE, SLT, WT | 8 Cyl 6.0 L CNG, 8 Cyl 6.0 L GAS
OEM (Genuine) 2003 GMC Sierra 3500 Muffler Asm-Exhaust (W/ Exhaust & T/Pipe & 3W
PartNumber: 15798952Product Specifications- Notes: 8.1 Liter Gas
- Other Names: Muffler, Muffler & Pipe
- Item Dimensions: 143.9 x 28.7 x 15.0 inches
- Item Weight: 80.30 Pounds
- Fitment Type: Direct Replacement
- Replaces: 15113070
- Part Description: 2003 GMC Sierra 3500 Muffler Asm-Exhaust (W/ Exhaust & T/Pipe & 3W
Vehicle Fitment- 2003 GMC Sierra 3500 | Base, SL, SLE, SLT, WT | 8 Cyl 6.0 L GAS, 8 Cyl 8.1 L GAS
OEM (Genuine) 2003 GMC Sierra 3500 Muffler Asm-Exhaust (W/ Exhaust Pipe & Tail Pipe)
PartNumber: 15262866Product Specifications- Notes: Silverado, Sierra; 6.6L; 6 1/2 Box; Crew Cab; 6.6 Liter Turbo Diesel, 1St Design, Crew Cab, 6 1/2 Foot Bed
- Other Names: Muffler, Muffler & Pipe
- Item Dimensions: 131.3 x 34.3 x 17.1 inches
- Item Weight: 333.20 Pounds
- Fitment Type: Direct Replacement
- Replaces: 15080245, 15131901
- Part Description: 2003 GMC Sierra 3500 Muffler Asm-Exhaust (W/ Exhaust Pipe & Tail Pipe)
Vehicle Fitment- 2003 GMC Sierra 3500 | Base, SL, SLE, SLT, WT | 8 Cyl 6.6 L DIESEL
OEM (Genuine) 2003 GMC Sierra 3500 Muffler
PartNumber: 15113058Product Specifications- Notes: 6.0 Liter Gas
- Part Description: 2003 GMC Sierra 3500 Muffler
Vehicle Fitment- 2003 GMC Sierra 3500 | Base, SLE, SLT, WT | 8 Cyl 6.0 L CNG, 8 Cyl 6.0 L GAS
OEM (Genuine) 2003 GMC Sierra 3500 Muffler Asm-Exhaust (W/ Exhaust Pipe & Tail Pipe)
PartNumber: 15262863Product Specifications- Notes: Silverado, Sierra; 6.6L; 8 Box; Standard Cab; All; 6.6 Liter Turbo Diesel, 1St Design, Standard Cab
- Other Names: Muffler, Muffler & Pipe
- Fitment Type: Direct Replacement
- Part Description: 2003 GMC Sierra 3500 Muffler Asm-Exhaust (W/ Exhaust Pipe & Tail Pipe)
Vehicle Fitment- 2003 GMC Sierra 3500 | Base, SL, SLE, SLT, WT | 8 Cyl 6.6 L DIESEL
FAQ for Muffler Repair
Q: How to install the muffler?
A:
You can install the oxygen sensor, a new exhaust muffler gasket, the insulators to the frame hangers, a new exhaust manifold pipe gasket, the insulators to the frame hangers, and lower the vehicle.
By Bob
GM Specialist
01/11/2022Q: What is the recommended bolt torque for the exhaust pipe clamp?
A:
The recommended bolt torque is 40 Nm (30 ft. lbs.).
By Bob
GM Specialist
01/11/2022Q: How to remove the muffler?
A:
You can remove the spare tire, install adjustable jack stands, remove the vent hose swivel clip, the rear axle vent hose, the vent hose swivel clip, the rear shock absorbers lower bolts and nuts, lower the rear axle using the adjustable jack stands, and the oxygen sensor if the muffler is being replaced.
By Bob
GM Specialist
01/11/2022